Insert for castings



July 2, 1929 CALDWELL v 1,719,739

' INSERT FOR CASTINGS Filed Sept. 10, 1928 ATTORNEY WITNESSES Cir Patented July 2 1929.

UNITED STATES LAFAYETTE HARDWIGK CALDWELL, OF CHATTANOQGA, TENNESSEE.

INSERT FOR CASTINGS.

Application filed. September 10, 1928.

This invention relates to improvements in the art of casting metals and it consists of the constructions, combinations and arrangements herein described and claimed.

One of the objects oi the invention. is to join two members (castings in the instant case) without either drilling into or through either member for the reception oi the securing bolt, the arrangement being such that the bolt will be mounted on the inside of the members and not visible from the outside thus avoiding marrin g the outer appearance.

Another object of the invention is to employ an insert for the purpose of forming a recess which will securely hold the head of a bolt, in which connection it serves as the foundation for a crib fron which the bolt extends when inserted in place.

Another object oi'the invention is to provide an insert which is of a configuration particularly suited to serve the purpose of a foundation for a crib in castings.

A further object of the invention is to pro- Vide a fastening means for castings and the like, according to which the drilling and tapping as Well as molding of holes andthe use of cotter pins are dispensed with.

Other objects and advantages appear in the following specification 1 reference being had to the accompanying drawing, in which Figure 1 is a side elevation of a stove leg, the improved casting structure being shown,

Figure 2 is a detail section taken on the line 9.2 of Figure 1,

Figure 3 is a cross section. of a portion of the stove leg as well as a portion of the base strip to which it attached by means Off the improved connection,

Figure lis a detail. Vertical section taken on the line 4-4 oi? Figure 1,

Figure 5 is a plan view oi the insert blank prior to being bent into shape,

Figure 6 is a plan View oi. the completed insert,

Figure 7 is an edge view as seen in the direction of the arrow in Figure 6,

Figure 8 is an inverted plan view of the insert,

Figure 9 is a perspective View of the insert.

As has been indicated by the statement in one of the objects of the invention, the purpose of the latter is to so join two members that the means by which the joint is made will. not be visible from the outside and, moreover, the joint will. be so firm that the n'lembers will not loosen up in ordinary use and thus Serial No. 305,092.

render the structure unsteady. The improved connection is primarily intended for use in joining a leg with the base strip of a stove, but the illustration herein of that purpose is not to be regarded as a limitation upon the use of the invention for the principles of the invention will be used in other parts oi a stove and in connecting members other than stove castings.

It is usual in the manufacture of stoves to either drill a hole in one member and tap it for the reception oi. a bolt which is fitted through a hole in another member to be secured. It is also usual to secure stove memhere by means of cotter pins. The first mode of connection consumes considerable time and is expensive, while the second mode results in an unsteady connection. It is not unusual to form a hole clear through a stove part and to introduce the bolt from the outside so that the head of the bolt shows. This mars the appearance of the structure.

According to the invention the head of the securing bolt is held more firmly than ii? it were screwed into a tapped hole, and it has the same advantage of secreting the bolt so that the connecting means is not visible on the outside of the stove. The purpose is carried out by. forming what is herein known as a crib on the inside of one of a pair of members to be joined. The foundation of this crib is an insert which is of a form particularly suited to the purpose.

ieiference is made to the drawing. The particular members to be joined comprise the leg 1. and base strip 2 oi? a stove. These members are castings. The stove leg has a set of lugs 3 (Fig. 1) with which a tongue 4: on the base strip 2 coacts in producing a snug tentative :[it. This lit is later made permanent by the use of a stove bolt 5 and nut 6. The boltpasses through a hole 7 in the tongue 4:. The tongue is so ofl'set from the base strip that it defines a cavity which becomes a chamber 8 when the tongue is applied to the inner side oft the stove leg.

The manner in which the head 9 of the stove bolt 5 is held securely in a secreted position is as follows: A crib 10 has a recess 11. which is wedge shaped in the longitudinal direction of the stove leg (Figs. 1 and 4-), and a slot 12 which opens at the inner side of? the crib both to admit. the head 9 to the recess and to receive the bolt 5. The bolt is inserted head down, that is to say with the head next to the inside of the leg 1, the threaded part of the bolt extending straight out through the slot 12, i position to receive the tongue 4 of the base strip 2. Having made this connection, the nut 6 is screwed down tight.

A wall 13 (Figs. 1 and 2) closes one side of the recess 11. It is adjacent to this wall that the slot 12 ends. The inner surface of the wall is bevelled to match the shape of the head the screwing down or the nut 6 will produce an outward thrusto t the head 9 against the bevelled sides of the recess 11. The connection will be very tight, and in ordinary use 'the leg 1 will never loosen.

The mode in which the crib 10 is formed so that the walls of the recess 1 will be smooth and both accurately and uniformly bevelled to make the best possible contact with the head 9 is as follows: An insert 14 (Figs. 5 to 9) is used for the purpose. This insert coinprises the foundation upon which the rib 10 is molded. The insert will be incorporated in the crib, and its form is such that sharp corners are defined particularly at 15, 16 and '17, although. sharp corners are not essential to a properly molded recess. It is possible to make the .corners round with the same effect as far as the recess is concerned.

Figures 6 to 9 illustrate the insert in its bent up fornn'that is to say, the form it assumes when ready to be incorporated in the casting. It'compri'ses top and side flanges 18 and 19 which ultimately become parts of the top of the crib 10 and of the wall 18. The

'1 longitudinal edgeof the side flanges 19 has an attached clip 20' of an exaggerated U- shape. This clip will be dished in the for- 'mation of the insert, as shown in Figure 9,

the angle of the dish being approximately 415 to suit theinclination of the sides of the head 9. i

The inner edge 21 of the clip matches a slot 22 in the top flange 18 when the clip is bent over into position. At thesame time the extreme edges 23 of the clip will match one edge of a pair of triangular tangs 24 formed on the edge of the flange 18 opposite to that side from which the flange 19 is bent. The tangs 2 1 are bent up to match the edges 23 (Fig. 9).

In use the insert l l will be disposed face down in respect to the back of the leg 1. It will be incorporated in the mold. Upon casting the metal the insert will become incorporated in the leg 1 it having been pointed out that by the use of the insert the crib 10 will be formed as nearly perfect as possible, but what is most important the use oi the insert makes it possible to accurately l'orm the recess 11 so that the stove bolt 5 can be fitted in a concealed position upon the leg. The ultimate connection of the second member of the stove with the leg will be as secure and more so as the best drilled and tapped joint.

In conclusion reference made to Figure This illustrates the stamped block. The in sert will be composed 01? a light metal. usually tin. It is deemed unnecessary to describe how the insert is bent into the final form in Figure 9 because this is a matter which has no direct bearing on the invention. The insert is bent into the ultimate shape shown in Fig ure 5), and this article incorporated in the casting, whether that be a stove or some other part, in the manner already brought out.

While the construction and arrangement of theiniproved art 01 casting metals is that oi a generally pre lerred form, obviously modifications and changes may be made without departing from the spirit of the invention or the scope of the claims.

I claim 1. An insert which has a flange with an opening, and a clip which is dished and has one edge following said opening.

2. An insert which has a flange with a slot that opens at one edge of the flange, and a clip of a substantial U-shape having one edge 'l'ollowing the slot and stopping at that edge of the flange where the-slot opens, said clip being dished to provide the wall of a bevelled recess.

3. An insert having a top flange, a side flange along one side of the top flange said top flange having a slot opening at the opiosite side which opposite side has a pair of triangular tangs adjacent to said slot. and a clip attached to the side llange, said clip having inner edges :lollowing the slot and having the extreme edges coinciding with one edge of the tangs, said clip being dished to agree with said side edges of the tangs.

1. An insert comprising connected flanges standing at angles to each other. one of the flanges having an opening, and a clip depending from the other flange and following the contour of the opening.

Signed at Chattanooga, in the county of Hamilton and State of Tennessee, this 29th day of August A. D. 1928.

LAFAYETTE HARDWICK CALDWELL.

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